package com.bwie.filter;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.annotation.Order;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.concurrent.TimeUnit;

/**
 * @author : Yoo19
 * @description :
 * @createDate : 2025/4/22 19:50 50
 */
@Configuration
@Order(1)
public class MyGlobFilter implements GlobalFilter {

    @Autowired
    StringRedisTemplate redisTemplate;


    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
//        获取请求参数
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        String url = request.getURI().getPath();
        System.out.println("请求路径是："+url);
        //白名单
        if(url.contains("/adminLogin")){
            return chain.filter(exchange);
        }
        if(url.contains("/Register")){
            return chain.filter(exchange);
        }
        //检查并校验token
        String token = request.getHeaders().getFirst("token");
        if(token == null || token.isEmpty()){
            System.out.println("token为空:"+url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        Claims claims = Jwts.parser().setSigningKey("123456").parseClaimsJws(token).getBody();
        Integer userId = claims.get("userId", Integer.class);

        String redisKey = "token-"+userId;
        String redisToken = redisTemplate.opsForValue().get(redisKey);
        if(redisToken == null || redisToken.isEmpty()){
            System.out.println("token已过期"+url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        if(!token.equals(redisToken)){
            System.out.println("token错误："+url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        //token 续期60分钟
        redisTemplate.expire(redisKey,60, TimeUnit.MINUTES);
        //放行
        System.out.println("放行："+url);
        return chain.filter(exchange);
    }
}
